Knockdown scaffolding.



4105744194. v PATENTED Nov; 17, 1903.

- W. HARRISON.

KNOOKDOWN SGAPFOLDI'NGL APPLICATION FILED MAY 25, 1903.

NO MODEL.

r in

.posts rectangular in cross-section.

UNITED STATES Patented November 17, 1903.

PATENT OFFICE.

KNOCKDOWN SCAFFOLDING.

SPECIFICATION forming part of Letters Patent No. 744,194, dated November17, 1903.

Application filed May 25. 1903- Serial No. 158,733. (No model.)

To all whom it may concern):

Be it known that I, WILLIAM HARRISON, a citizen of the United States,residing at Grand Rapids, in the county of Kent and State ofMichigamhaveinvented new and useful Improvements in' KnockdownScaffolding, of which the following is a specification.

This invention relates to a new and useful knockdown scaffolding to beused wherever temporary scaffolding is required for building purposesand the like.

The invention consists in combining with upright rectangular postslongitudinal and transverse bars provided with notched plates, wherebythe scaifolding will stand firmly and rigidly in place when set up andwhich can be readily taken down for the purpose of transportation.

The objects of my invention are, first, to furnish a removablescaffolding which can be set up quickly and readily and which can bereadily taken down and removed; second, to furnish a scaffolding thatwhen erected will stand rigidly and Without swaying and have sufficientstrength for all practical purposes; third, to furnish a knockdownscaffolding which can be extended or contracted at pleasure. Theseobjects I accomplish by means of the mechanism illustrated in theaccompanying drawings, in which Figure 1 shows a perspective View, on anenlarged scale, of a corner-post, one of the transverse bars attachedthereto. Fig. 2 shows a perspective View of a series of Vertical postsand longitudinal and horizontal bars secured together in accordance withmy invention. Fig. 3 shows a horizontal section of one of the verticalposts, together with a plan view of a portion of two of the longitudinalbars, the bars being secured to the post by means of metallic plates andbolts, as hereinafter described.

A shows a series of vertically-extending These posts may be of anysuitable size; but I prefor to make them two by four inches incrosssection.

B B, 850., show the horizontally-extending bars, which engage with thevertical posts. G G show the longitudinally-extending bars,

which engage with the said vertical posts in the manner hereinafterdescribed.

zontal bars being similarly constructed.

E and F denote bolts for attaching the plates to the longitudinal orhorizontal bars, and

any number of these bolts may be employed,

as occasion requires. Each of the plates C extends beyond the end of themember or bar to which it is attached, and in the part of the platewhich projects is provided with a notch H, which receives the neck ofthe bolt D, as shown in Fig. 1. The belt D is secured to the verticalpost and projects a sufficient distance beyond, as above stated, toallow the plate (3, by means of the notch H, to engage with the boltback of the head of the bolt.

In extending the scaitolding the plates E overlap each other, as shownin Fig. 3, and the bolt at this point extends a sufficient distancebeyond the upright A to allow the notched ends of the plates to engagewith the bolt D beneath the head of the same. The ends of the sidepieces fit close against the fiat perpendicular sides of the uprights,thus forming a brace,'as it were,and giving rigidity to' the structure,and the structure when set up and bound together by means of the platesand bolts is very firm and secure, and the scafiolding may be quicklytaken down and may be easily setup for-use.

It will be noted that the square ends of the horizontal members and thelongitudinal members,beariug, as they do, against the perpendicularsurface of the Vertical bars, will prevent the structure from tilting orswaying.

In order to give greater rigidity against lateral motion, I providebraces, one of which is shown by I, each of which braces is pivoted toan upright by the pivot K, as shown in Fig. 2. Thus this pivoted braceis adapted when not in use to fold in close contact to the upright towhich it is attached.

A scafiolding so constructed can be extended longitudinally to anyrequired distance and can be readily adapted to any purpose where atemporary scaitolding is required.

Having thus described my invention, what I claim to have invented, anddesire to secure by Letters Patent, is-

idly connecting said longitudinal members to said vertical members, anda plurality of notched plates secured to said horizontallyextendingmembers and adapted to engage the other of said bolts for detachably andrigidly securing said horizontally-extending members to saidvertically-extending membets;

2. A knockdown scafiolding comprising a plurality ofvertically-extending members, each of which is rectangular incross-section, a plurality of longitudinally-extending members havingtheir ends abutting against one side of the vertical members, aplurality of horizontally-extending members having their ends abuttingagainst another side of said vertical members, headed bolts carried byand projecting from the vertical members, a plurality of notched platessecured to said longitudinal members and adapted to engage with certainof said bolts at the back of the heads thereof for detachably andrigidly con meeting said longitudinal members to said vertical members,and a plurality of notched plates secured to said horizontally-extendingmembers and adapted to engage the other of said bolts at the back of theheads thereof for detachably and rigidly securing saidhorizontally-extending members to said vertically-extending members.

3. A knockdown scaffolding comprising a plurality ofvertically-extending members, each of which is rectangular incross-section, a plurality of longitudinally-extending members havingtheir ends abutting against one side of the vertical members, aplurality of horizontally-extending members having their ends abuttingagainst another side of said vertical members, bolts carried andprojecting from the vertical members, a plurality of notched platessecured to said longitudinal members and adapted to engage with certainof said bolts for detachably and rigidly connecting said longitudinalmembers to said vertical members, a plurality of notched plates securedto said horizontally-extending members and adapted to engage the otherof said bolts for detachably and rigidly securing saidhorizontally-extending members to said vertically-extending members, anda plurality of foldable brace members pivotally connected to saidvertical members.

4. A knockdown scatfoldiug comprising a plurality ofvertically-extending members, each of which is rectangular incross-section, a plurality of longitudinally-extending members havingtheir ends abutting against one side of the vertical members, aplurality of horizontally-extending members having their ends abuttingagainst another side of said vertical members, headed bolts carried byand projecting from the vertical members, a plurality of notched platessecured to said longitudinal members and adapted to engage with certainof said bolts at the back of the heads thereof for detachably andrigidly securing said longitudinal members to said vertical members, aplurality of notched plates secured to said horizontally-extendingmembers and adapted toengage the other of said bolts at the back of theheads thereof for detachably and rigidly securing saidhorizontally-extending members to said verticallyextending members, anda plurality of foldable brace members pivotally connected to saidvertical members.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

WILLIAM HARRISON.

Witnesses:

MARY S. TOOKER, CLARA HAMILTON.

